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    <script>
        // instanceof 可以用于引用类型的检测。基本数据类型无效

        // 基本类型 无效
        console.log('1' instanceof String) // false
        console.log(1 instanceof Number)
        console.log(true instanceof Boolean)
        console.log(Symbol('id') instanceof Symbol)
        console.log(9007199254740999n instanceof BigInt)
        console.log(BigInt(9007199254740999) instanceof BigInt)

        // instanceof 只能用于引用类型的检测
        console.log({}
            instanceof Object) // ture
        console.log([] instanceof Object) // true
        console.log(function () {}
            instanceof Function) // true
    </script>
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